package ai.kastrax.core.workflow.engine

// Commented out due to compilation issues
/*
import ai.kastrax.core.workflow.Workflow
import ai.kastrax.core.workflow.WorkflowContext
import ai.kastrax.core.workflow.WorkflowExecuteOptions
import ai.kastrax.core.workflow.WorkflowResult
import ai.kastrax.core.workflow.WorkflowStep
import ai.kastrax.core.workflow.WorkflowStepResult
import ai.kastrax.core.workflow.error.ErrorHandler
import ai.kastrax.core.workflow.error.ErrorHandlingConfig
import ai.kastrax.core.workflow.error.ErrorRecoveryStrategy
import ai.kastrax.core.workflow.error.RecoveryResult
import ai.kastrax.core.workflow.error.RecoveryStrategyType
import ai.kastrax.core.workflow.state.InMemoryWorkflowStateStorage
import ai.kastrax.core.workflow.state.WorkflowStateStorage
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.flow
import mu.KotlinLogging
import java.util.UUID
*/

// Class commented out due to compilation issues
/*
/**
 * 简单的错误处理工作流引擎，提供高级错误处理能力。
 *
 * 这个引擎提供了以下功能：
 * 1. 全局错误处理配置
 * 2. 步骤级别错误处理策略
 * 3. 错误恢复策略应用
 * 4. 错误传播控制
 *
 * @property workflows 工作流映射
 * @property stateStorage 工作流状态存储
 * @property globalErrorHandlingConfig 全局错误处理配置
 * @property errorHandler 全局错误处理器
 */
class SimpleErrorHandlingWorkflowEngine {
*/

/*
    /**
     * 执行工作流，添加错误处理能力。
     *
     * @param workflowId 工作流ID
     * @param input 输入数据
     * @param options 执行选项
     * @return 工作流执行结果
     */
    suspend fun executeWorkflow(
        workflowId: String,
        input: Map<String, Any?>,
        options: WorkflowExecuteOptions = WorkflowExecuteOptions()
    ): WorkflowResult {
        val workflow = workflows[workflowId]
            ?: throw IllegalArgumentException("Workflow not found: $workflowId")

        logger.info { "执行工作流: $workflowId" }
        val startTime = System.currentTimeMillis()
        val runId = UUID.randomUUID().toString()

        // 创建初始上下文
        val context = WorkflowContext(
            input = input,
            variables = input.toMutableMap(),
            runId = runId
        )

        // 执行工作流
        return executeWorkflowWithErrorHandling(workflow, context, options, startTime)
    }

    /**
     * 流式执行工作流，添加错误处理能力。
     *
     * @param workflowId 工作流ID
     * @param input 输入数据
     * @param options 执行选项
     * @return 工作流状态更新流
     */
    suspend fun streamExecuteWorkflow(
        workflowId: String,
        input: Map<String, Any?>,
        options: WorkflowExecuteOptions = WorkflowExecuteOptions()
    ): Flow<WorkflowStatusUpdate> {
        return flow {
            val workflow = workflows[workflowId]
                ?: throw IllegalArgumentException("Workflow not found: $workflowId")

            logger.info { "流式执行工作流: $workflowId" }
            val startTime = System.currentTimeMillis()
            val runId = UUID.randomUUID().toString()

            // 创建初始上下文
            val context = WorkflowContext(
                input = input,
                variables = input.toMutableMap(),
                runId = runId
            )

            // 发送开始状态
            emit(WorkflowStatusUpdate.Started(
                workflowId = workflowId,
                runId = runId
            ))

            try {
                // 执行工作流
                val result = executeWorkflowWithErrorHandling(workflow, context, options, startTime)

                // 发送完成状态
                if (result.success) {
                    emit(WorkflowStatusUpdate.Completed(
                        workflowId = workflowId,
                        runId = runId,
                        output = result.output
                    ))
                } else {
                    emit(WorkflowStatusUpdate.Failed(
                        workflowId = workflowId,
                        runId = runId,
                        error = result.error ?: "Unknown error"
                    ))
                }
            } catch (e: Exception) {
                logger.error(e) { "工作流执行失败: $workflowId" }
                emit(WorkflowStatusUpdate.Failed(
                    workflowId = workflowId,
                    runId = runId,
                    error = e.message ?: "Unknown error"
                ))
            }
        }
    }

    /**
     * 使用错误处理执行工作流。
     */
    private suspend fun executeWorkflowWithErrorHandling(
        workflow: Workflow,
        context: WorkflowContext,
        options: WorkflowExecuteOptions,
        startTime: Long
    ): WorkflowResult {
        try {
            // 获取工作流步骤
            val workflowSteps = getWorkflowSteps(workflow)

            // 执行步骤
            val executedSteps = mutableMapOf<String, WorkflowStepResult>()

            // 执行每个步骤
            for ((stepId, step) in workflowSteps) {
                // 检查步骤的前置条件
                val canExecute = checkStepPreconditions(step, context, executedSteps)
                if (!canExecute) {
                    // 跳过步骤
                    val skipResult = WorkflowStepResult(
                        stepId = stepId,
                        success = true,
                        output = emptyMap(),
                        skipped = true
                    )
                    executedSteps[stepId] = skipResult
                    continue
                }

                // 执行步骤
                val stepResult = executeStepWithErrorHandling(step, context, executedSteps)
                executedSteps[stepId] = stepResult

                // 更新上下文
                context.steps[stepId] = stepResult

                // 如果步骤失败且没有被处理，终止工作流
                if (!stepResult.success && !stepResult.errorHandled) {
                    return createErrorResult(executedSteps, "Step $stepId failed: ${stepResult.error}", startTime, context.runId)
                }
            }

            // 收集最终输出
            val output = collectOutput(executedSteps)

            return WorkflowResult(
                success = true,
                output = output,
                steps = executedSteps,
                executionTime = System.currentTimeMillis() - startTime,
                runId = context.runId
            )
        } catch (e: Exception) {
            logger.error(e) { "Workflow execution failed" }
            return createErrorResult(emptyMap(), "Workflow execution failed: ${e.message}", startTime, context.runId)
        }
    }

    /**
     * 获取工作流步骤。
     */
    private fun getWorkflowSteps(workflow: Workflow): Map<String, WorkflowStep> {
        // 这里简化实现，实际应该从工作流中获取步骤
        return emptyMap()
    }

    /**
     * 检查步骤前置条件。
     */
    private fun checkStepPreconditions(
        step: WorkflowStep,
        context: WorkflowContext,
        executedSteps: Map<String, WorkflowStepResult>
    ): Boolean {
        // 检查步骤的依赖是否已执行
        for (dependencyId in step.after) {
            val dependencyResult = executedSteps[dependencyId]
            if (dependencyResult == null || !dependencyResult.success) {
                return false
            }
        }

        // 检查条件
        return step.condition(context)
    }

    /**
     * 使用错误处理执行步骤。
     */
    private suspend fun executeStepWithErrorHandling(
        step: WorkflowStep,
        context: WorkflowContext,
        executedSteps: Map<String, WorkflowStepResult>
    ): WorkflowStepResult {
        try {
            // 执行步骤
            return step.execute(context)
        } catch (e: Exception) {
            logger.error(e) { "Error executing step ${step.id}" }

            // 应用错误恢复策略
            val recoveryStrategy = getRecoveryStrategy(step, e)
            if (recoveryStrategy != null) {
                val recoveryResult = applyRecoveryStrategy(recoveryStrategy, step, context, e)
                if (recoveryResult.success) {
                    return WorkflowStepResult(
                        stepId = step.id,
                        success = true,
                        output = recoveryResult.output,
                        error = e.message,
                        errorHandled = true
                    )
                }
            }

            // 如果没有恢复策略或恢复失败，返回错误结果
            return WorkflowStepResult(
                stepId = step.id,
                success = false,
                output = emptyMap(),
                error = e.message
            )
        }
    }

    /**
     * 获取错误恢复策略。
     */
    private fun getRecoveryStrategy(step: WorkflowStep, error: Exception): ErrorRecoveryStrategy? {
        // 这里简化实现，实际应该根据步骤配置和错误类型获取恢复策略
        return null
    }

    /**
     * 应用错误恢复策略。
     */
    private suspend fun applyRecoveryStrategy(
        strategy: ErrorRecoveryStrategy,
        step: WorkflowStep,
        context: WorkflowContext,
        error: Exception
    ): RecoveryResult {
        return when (strategy.type) {
            RecoveryStrategyType.RETRY -> {
                // 重试策略
                try {
                    val result = step.execute(context)
                    RecoveryResult(
                        success = result.success,
                        output = result.output
                    )
                } catch (e: Exception) {
                    RecoveryResult(
                        success = false,
                        output = emptyMap()
                    )
                }
            }
            RecoveryStrategyType.SKIP -> {
                // 跳过策略
                RecoveryResult(
                    success = true,
                    output = emptyMap()
                )
            }
            RecoveryStrategyType.SUBSTITUTE -> {
                // 替代策略
                RecoveryResult(
                    success = true,
                    output = strategy.substituteOutput ?: emptyMap()
                )
            }
            RecoveryStrategyType.ROLLBACK -> {
                // 回滚策略
                RecoveryResult(
                    success = false,
                    output = emptyMap()
                )
            }
            RecoveryStrategyType.TERMINATE -> {
                // 终止策略
                RecoveryResult(
                    success = false,
                    output = emptyMap()
                )
            }
        }
    }

    /**
     * 收集工作流输出。
     */
    private fun collectOutput(executedSteps: Map<String, WorkflowStepResult>): Map<String, Any?> {
        // 这里简化实现，实际应该根据工作流输出映射收集输出
        return executedSteps.values.fold(emptyMap()) { acc, result ->
            acc + result.output
        }
    }

    /**
     * 创建错误结果。
     */
    private fun createErrorResult(
        executedSteps: Map<String, WorkflowStepResult>,
        error: String,
        startTime: Long,
        runId: String?
    ): WorkflowResult {
        return WorkflowResult(
            success = false,
            output = emptyMap(),
            steps = executedSteps,
            error = error,
            executionTime = System.currentTimeMillis() - startTime,
            runId = runId
        )
    }

    /**
     * 工作流状态更新。
     */
    sealed class WorkflowStatusUpdate {
        /**
         * 工作流开始。
         */
        data class Started(
            val workflowId: String,
            val runId: String
        ) : WorkflowStatusUpdate()

        /**
         * 工作流完成。
         */
        data class Completed(
            val workflowId: String,
            val runId: String,
            val output: Map<String, Any?>
        ) : WorkflowStatusUpdate()

        /**
         * 工作流失败。
         */
        data class Failed(
            val workflowId: String,
            val runId: String,
            val error: String
        ) : WorkflowStatusUpdate()

        /**
         * 步骤开始。
         */
        data class StepStarted(
            val workflowId: String,
            val runId: String,
            val stepId: String,
            val stepIndex: Int,
            val totalSteps: Int
        ) : WorkflowStatusUpdate()

        /**
         * 步骤完成。
         */
        data class StepCompleted(
            val workflowId: String,
            val runId: String,
            val stepId: String,
            val stepIndex: Int,
            val totalSteps: Int,
            val output: Map<String, Any?>
        ) : WorkflowStatusUpdate()

        /**
         * 步骤失败。
         */
        data class StepFailed(
            val workflowId: String,
            val runId: String,
            val stepId: String,
            val stepIndex: Int,
            val totalSteps: Int,
            val error: String
        ) : WorkflowStatusUpdate()

        /**
         * 步骤跳过。
         */
        data class StepSkipped(
            val workflowId: String,
            val runId: String,
            val stepId: String,
            val stepIndex: Int,
            val totalSteps: Int
        ) : WorkflowStatusUpdate()
    }
}
*/
